Abstract
Smart structural control is now emerging as an alternative to conventional earthquake resistant design and traditional structural control techniques. Fuzzy logic based control is one of the promising smart control strategies that could be used for this function. Magneto Rheological (MR) dampers are considered one of the promising semi-active control devices that can be used to control the structural response of buildings under earthquake excitation. The properties of MR dampers can be controlled using several smart techniques such as Fuzzy Logic. In this paper, a comparative analysis is conducted to investigate the most optimum location for placing MR dampers, which are controlled by Fuzzy Logic, in a three-degree-of-freedom benchmark problem. The study explores three potential schemes for allocating and operating MR dampers within the system under consideration. Two main structural response parameters are considered in this study, maximum displacement and maximum acceleration. In addition, the study investigates the lowest number of fuzzy-controlled MR dampers that are required in order to produce the required structural behaviour. This is an initial step towards the development of a generic allocation algorithm that is capable of identifying the required number of MR dampers, and their location, for controlling any multi-degree-of-freedom system.
Highlights
Structures are designed to be able to resist dynamic loads with enough ductility to ensure the ability of structures to retain its strength under severe loading conditions and provide enough warning before failure
The problem here lies in the fact that the relation between the electric current applied to the damper and the force generated by the damper is nonlinear; it has always been an important point of research to develop effective control strategies to calculate the electric current or voltage to be able to obtain full usage of Magneto rheological (MR) dampers
It can be recommended to use only one MR damper between ground and first floor as an optimum solution to structural response control; this is true in case the obtained reduction in structural response is acceptable
Summary
Structures are designed to be able to resist dynamic loads with enough ductility to ensure the ability of structures to retain its strength under severe loading conditions and provide enough warning before failure This concept has two main disadvantages as follows [1]: 1-Structures depend on their constant small damping ability to dissipate the earthquake energy with no welldefined guidelines to be able to improve the damping properties of commonly used materials in construction. Based on previously conducted research [3, 6, 7, 8], it is found that few researchers have investigated the use of fuzzy control for controlling Multi-Degree-of-Freedom (MDOF) systems using multiple MR dampers. The study investigates the lowest number of fuzzy-controlled MR dampers that are required in order to produce the required structural behaviour
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